V2013.14

Agenda

• Old Business – – – Executive Committee LCCUG meeting volunteer(s) Reward Points Program • New Business – – Weekly Quiz Updated Website • Raspberry Pi Sensor Project – Intro to Python – LED Avon High School Tech Club 2

Executive Committee

• President – Name • Vice President – Name • Communications Director – Name • Treasurer – Name • Term begins next school year Avon High School Tech Club 3

Lorain County Computer User Group

• Website: www.lccug.com

• Established around 1990 • The majority of their members are retired • Have a variety of knowledge and skills • June 10 th Meeting: 6:00 – 7:30PM • Present on a topic of our choice • Volunteers?

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Avon Library Explorers Program

• June 24 th – at the Avon Public Library Mini Explorers (Pre K - Kindergarten) • 12:30-1:30 PM – Explorers (1 st - 5 th • 2:00 -3:00 PM Grade) • Theme is “

Fun with Robotics

” • Game/activity/experiment that will be engaging, but not too advanced for respective age groups • Any kid-friendly games or activities that we want to develop would be perfect Avon High School Tech Club 5

Weekly Quiz

• What command should you use to immediately & gracefully shutdown and halt the Raspberry Pi?

–

sudo shutdown –h now

• What command would you use to find the amount of free memory?

–

free -h

• Which command shows a list of commands you recently typed?

–

history

• What command would you use to reconfigure the Raspberry Pi?

–

sudo raspi-config

• • What Raspberry Pi feature will we use to communicate with off board sensors?

– GPIO

No perfect scores!

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Reward Points Program

• Earn reward points for: – – – – – Completing surveys, polls, etc.

Completing weekly tasks Completing projects Participate during meetings Volunteer opportunities • Redeem points for: – – Tech Club gear Other prizes • Create reward levels Avon High School Tech Club 7

Raspberry Pi Sensor Project

• Goals for today: – – – Editors Intro to Python Connect LED Avon High School Tech Club 8

Getting Started: Editors

• nano • IDLE • Geany Avon High School Tech Club 9

Our First Python Program

• Create the

hellopi.py

file using nano as follows:

nano -c hellopi.py

• Within our

hellopi.py

file, add the following code:

#!/usr/bin/python #hellopi.py

print ("Hello Raspberry Pi")

• When done, save and exit (

Ctrl

+

X

,

Y

, and

Enter

) • To run the file, use the following command:

python hellopi.py

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Challenges for Reward Points

• Change “Hello Raspberry Pi” text to red • Show CPU speed or Temperature • Add ‘LED on/LED off’ to blink code • Have the on/off message coincide with LED • See website code samples for guidance Avon High School Tech Club 11

Using GPIO: Raspberry Pi Pinout

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Using GPIO: Power a LED

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Resistor connects between Ground and LED cathode (short lead) Connect jumper from 3.3v to LED anode (long lead) Connect black wire to Ground, pin 6 Connect red wire to 3.3v, pin 1 13

Using GPIO: Code to Blink LED #!/usr/bin/env python # Must be run as root: sudo python blink11led.py # Import necessary modules # Provides various time-related functions import time # Control Raspberry Pi GPIO channels import RPi.GPIO as GPIO

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Using GPIO: Code to Blink LED # Blinking function, turns LED on/off def blink(pin): # Turn LED on GPIO.output(pin, GPIO.HIGH) # Pause for 1 second time.sleep(1) # Turn LED off GPIO.output(pin, GPIO.LOW) # Pause for 1 second time.sleep(1) return

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Using GPIO: Code to Blink LED # Use Raspberry Pi board pin numbers GPIO.setmode(GPIO.BOARD) # Set the output channel/pin GPIO.setup(11, GPIO.OUT) # Blink LED 10 times for i in range(0,10): blink(11) # Reset any GPIO pins when you exit the program GPIO.cleanup()

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Using GPIO: Blinking LED

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Remove red wire Connect yellow wire from pin 11 to anode of LED (long lead) 17

More Python Fun

• Code samples: – – Add colors to terminal Get system information • See our webpage under ‘Raspberry Pi Workshop’ – Look for ‘additional Python examples to try!’ Avon High School Tech Club 18

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Backup Slides

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How do Python Programs Run?

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